orika core工具对实体（Bean）进行深度拷贝

1. 在pom.xml中添加orika core依赖：

 <!-- https://mvnrepository.com/artifact/ma.glasnost.orika/orika-core -->
        <dependency>
            <groupId>ma.glasnost.orika</groupId>
            <artifactId>orika-core</artifactId>
            <version>1.4.1</version>
        </dependency>

2.1. 指定属性名

User1和User2是两个实体，部分属性一致：

User1.java 如下：

public class User1 {
    private String name;
    private Integer age;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "User1{" +
                "name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
}

User2.java如下：

public class User2 {
    private String name2;
    private Integer age;
    private String agent;

    public String getName2() {
        return name2;
    }

    public void setName2(String name2) {
        this.name2 = name2;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public String getAgent() {
        return agent;
    }

    public void setAgent(String agent) {
        this.agent = agent;
    }

    @Override
    public String toString() {
        return "User2{" +
                "name2='" + name2 + '\'' +
                ", age=" + age +
                ", agent='" + agent + '\'' +
                '}';
    }
}

使用orika core可以将User1的内容复制到User2，对于属性名不一致的，可以手动设置对应的field，属性名一致的则可以忽略不显式说明：

import ma.glasnost.orika.MapperFacade;
import ma.glasnost.orika.MapperFactory;
import ma.glasnost.orika.impl.DefaultMapperFactory;

public class Demo03 {
    public static void main(String[] args) {
        MapperFactory mapperFactory = new DefaultMapperFactory.Builder().build();
        mapperFactory.classMap(User1.class, User2.class)
                .field("name", "name2")
                .byDefault()
                .register();

        User1 user1 = new User1();
        user1.setName("user1");
        user1.setAge(1);

        MapperFacade mapperFacade = mapperFactory.getMapperFacade();
        User2 user2 = mapperFacade.map(user1, User2.class);
        System.out.printf("user2: " + user2.toString());
    }
} 

输出结果：

user2: User2{name='user1', age=1, agent='null'}

2.2. 可以编写通用的工具类，对同样的属性名进行拷贝：

import ma.glasnost.orika.MapperFacade;
import ma.glasnost.orika.MapperFactory;
import ma.glasnost.orika.impl.DefaultMapperFactory;

import java.util.List;

public class OrikaBeanMapper {
    private static final MapperFacade mapperFacade;

    static {
        MapperFactory mapperFactory = new DefaultMapperFactory.Builder().useAutoMapping(true).mapNulls(true).build();
        mapperFacade = mapperFactory.getMapperFacade();
    }

    public static <S, D> void map(S from, D to) {
        mapperFacade.map(from, to);
    }

    public static <S, D> D map(S from, Class<D> clazz) {
        return mapperFacade.map(from, clazz);
    }

    public static MapperFacade getMapperFacade() {
        return mapperFacade;
    }

    public static <S, D> List<D> mapAsList(Iterable<S> source, Class<D> destinationClass) {
        return mapperFacade.mapAsList(source, destinationClass);
    }
}

通用工具类的使用：

public class Demo04 {
    public static void main(String[] args) {
        User1 user1 = new User1();
        user1.setAge(1);
        user1.setName("user1");
        User2 user2 = OrikaBeanMapper.map(user1, User2.class);
        System.out.println(user2.toString());
    }
}

输出结果：

User2{name2='null', age=1, agent='null'}